<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <button @click="num--">-</button>
          {{num}}
      <button @click="num++">+</button>
    </div>

    <script src="../js/vue.js"></script>
    <script>
      var app = new Vue({
        el: "#app",
        data: {
          num: 10,
        },
      });
    </script>
  </body>
</html>
